IPP Greenvolt Power has started building its Siedlce battery storage project in Poland, while Gore Street, Taaleri Energia and DS1 have moved to construction on projects in Poland, Estonia and Lithuania respectively. 

GridStor, a US-based developer and operator of grid-scale battery energy storage systems (BESS) has closed a US$220 million financing agreement for the 100MW/400MWh White Tank project in Arizona, US.

A flurry of project completions, financings and supplier deals for large-scale BESS across the Central and Eastern Europe (CEE) region, from Greenvolt, Renovatio & CATL, Eurowind, Renalfa, MOL Group, Tavion, MetaWealth and Enexus & Longi. 

Residential battery energy storage systems (BESS) across California discharged more than 580MW of peak power to the state’s grid on the evening of 9 September 2026 via a Tesla-Sunrun VPP.

Utility PG&E has selected six new California microgrid projects for a US$30 million investment, while Massachusetts’ Department of Energy Resources is awarding US$40 million across 36 BESS projects.

RWE has taken a final investment decision (FID) on 400MW/1.1GWh BESS in the Netherlands with construction to start in due course, while Giga Storage has started building its 2.8GWh Green Turtle project in Belgium.

A US battery storage pilot sponsored by tech giant Google has demonstrated how batteries can capture surplus renewable energy and deliver it during hours with greater fossil generation.

Poland’s grid-scale storage market has reached an impressive scale in the last few years, helped by the capacity market and various government schemes, but numerous challenges now need to be overcome.

Vishal Mittal, founder and CEO of Delectrik makes the case for flow batteries to meet India’s long-duration needs in an exclusive ESN Premium interview.

In this US news roundup, Eos has received an advance on its DOE loan, FlexGen and Lighshift have partnered on 16 BESS projects, and Georgia Power has energised a 128MW BESS.